Fitness calculators
Fitness calculators estimate BMI, BMR, calories, and related body metrics from the equations printed on each page. They are screening and planning aids, not a medical assessment.
Results depend on the formula named in How it works (for example Mifflin–St Jeor for BMR). Compare BMI with BMR or calorie targets when you need context, and treat outputs as approximate.
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Fitness
BMI Calculator
Body mass index from weight and height (Metric or US units).
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Fitness
BMR Calculator
Basal metabolic rate via the Mifflin–St Jeor equation.
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Fitness
Body Fat Calculator
Estimate body-fat percentage with the U.S. Navy method.
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Fitness
Calorie Calculator
Daily calorie target from BMR, activity, and goal.
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Fitness
Calories Burned Calculator
Estimate calories burned from MET, weight, and duration.
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Fitness
Heart Rate Zones Calculator
Rough training zones from max HR or 220−age.
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Fitness
Ideal Weight Calculator
Ideal body weight estimate using the Devine formula.
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Fitness
Lean Body Mass Calculator
Lean body mass estimate using the Boer formula.
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Fitness
Macro Split Calculator
Grams of protein, carbs, and fat from calorie share percents.
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Fitness
Maintenance Calorie Calculator
Daily maintenance calories (TDEE) from BMR and activity.
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Fitness
One Rep Max Calculator
Estimated 1RM using the Epley formula.
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Fitness
Pace Calculator
Running/walking pace per unit distance from time and distance.
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Fitness
Pace to Race Time Calculator
Finish time from pace and distance.
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Fitness
Protein Target Calculator
Daily protein grams from body weight and g/kg factor.
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